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Abstract

Power conversion system includes power amplifiers that receive D.C. potentials from rectifying and filtering circuitry that direct couple the power amplifiers to the conventional A.C. power lines. An output transformer couples the power amplified signal to an output terminal. A feedback network couples the output terminal to one input of a signal combiner that has a reference input terminal for receiving a reference signal. An isolation amplifier couples the output of the signal combiner to the input of the power amplifiers. The isolation amplifier has a combining network that receives on one input a signal from the input terminal coupled through a high pass filter cascaded with a transformer coupled amplifying stage and on the other input from the input terminal through an optocoupler amplifying stage cascaded with a low pass filter. The power amplifiers comprise like class B amplifiers having substantially the same gain driving the primary of the output transformer. An attenuator imparts an attenuation to the output of the first amplifier that is the reciprocal of the amplifier gain and delivers the attenuated signal to the input of the second amplifier. Current shunts in series with a lead from the rectifiers and filters provide a signal representative of the current drawn by each of the class B amplifiers. For D.C. output, there is a precision diode and 600 Hz signal inverter that couples the output of the signal combining network with the isolation amplifier and a 600 Hz output transformer cascaded with a rectifier and filter that couples the output of the power amplifiers to the output terminal.

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